Ofcourse lumion is not designed to include your own speed tree trees. The speedtree SDK and compiler are only available when you purchase a license from Speedtree and then it's still a question what you are allowed to do with that license. You can mess around with Lumion and try your own trees if you can get them in and you managed to get the Speedtree SDK but we do not officially support this in Lumion.

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The way we add trees is by using the speedtree modeler and compiler to generate compiled trees and put them in the trees folder. The thumbnail is not a requirement for the trees to work. You should be able to paint your own trees if you manage to get compiled trees in the trees folder.